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ATSHA204 Datasheet(PDF) 44 Page - ATMEL Corporation

Part # ATSHA204
Description  Atmel CryptoAuthentication
PDF  65 Pages
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Manufacturer  ATMEL [ATMEL Corporation]
Direct Link  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

ATSHA204 Datasheet(HTML) 44 Page - ATMEL Corporation

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Atmel ATSHA204 [DATASHEET]
44
8740D
−CRYPTO−3/12
See the NIST HMAC specification for a complete description of how the various digests are calculated using SHA-256, the
HMAC key, and appropriate padding. See http://csrc.nist.gov/publications/fips/fips198/fips-198a.pdf. The padding is part of the
SHA-256 message (see Section 3.1). HMAC is a construct that sits on top of SHA-256.
Table 8-19. Mode Encoding
Bits
Meaning
7
Must be zero.
6
If set, include the 48 bits SN[2:3] and SN[4:7] in the message.
Otherwise, the corresponding message bits are set to zero.
5
Include the first 64 OTP bits (OTP[0] through OTP[7]) in the message.
Otherwise, the corresponding message bits are set to zero.
If Mode[4] is set, the value of this mode bit is ignored.
4
Include the first 88 OTP bits (OTP[0] through OTP[10]) in the message.
Otherwise, the corresponding message bits are set to zero.
3
Must be zero.
2
The value of this bit must match the value in TempKey.SourceFlag or the command will return an error.
0-1
Must be zero.



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